Watch Windows 10 in action
9 10 is coming along nicely, and we should have an official build from Microsoft to play with shortly. But there are also leaked builds and WinFuture took it upon them to record a video with its new features.
This video is all about the new start menu as you can see; plus you can take a glimpse of how Metro apps will run in a window if you like. Notably absent from the video is the new Notification Centre that is planned for Windows
9 10, but from screenshots that hit the web a few days ago it seems to be in the very early stages of development.
Source: WinFuture (auf Deutsch)